Arc-lamp.



.l. T. BEECHLYN.

ARC LAMPn n APPLICATION FILED MAY8,1912. 1,218,509, Patented Mar. 6, 1917.

' Fig. I /6 /.9 5 L9 Fl .5. 42 f Z7 4% m H Witness? an 7' J lnventorz /64 John T. Beechlyn, I QM g Hls fittorneg UNITED STATES PAJIEN OFFICE.

JOHN T. BEEGHLYN, OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION 035 NEW YORK.

ARC-LAMP.

Application filed May 8, 1912.

To all whom it may concern:

Be it known that I, JOHN T. BEECHLYN, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Arc Lamps, of which the following is a specification.

My invention has reference to an arc lamp of the focusing type.

Focusing lamps have heretofore been made, in which the electrodes are caused to advance toward or rccede from each other in step by connecting them together by means of a flexible connection passing over a pulley. In such an arrangement the arc is established by a movement of both of the electrodes away from each other, and'is subsequently regulated by a movement of both of. the electrodes in response to variations of current in the arc. In such a lamp, however, on account of the inertia of the two electrodes and of the connected parts and on account of friction, the moving parts do not quickly respond to variations in current, which results in a sluggish and unsatisfactory regulation. I have overcome this defeet by a novel arrangement whereby the regulation of the arc is effected by but one of the electrodes, while both of the elec trodes are intermittently fed toward each other. In this way but a single electrode is involved in the regulation, and the inertia of the moving parts is, therefore, small as compared with the ordinary focusing lamp, in which both of the electrodes must be moved to effect the regulation. At the same time, since both of the electrodes are moved toward each other in the feeding operation, the arc is kept focused.

I have illustrated my invention in the accompanying drawings, in which Figure 1 is a skeleton of my lamp, showing the operating parts and the electrical connections; Fig.2 is a detail view of the counterweight for the lower electrode; Fig. 3 is a detail horizontal section along line 33 Fig. 2, and Fig. 4 is a perspective View of the counterweight.

In the drawings, 1 is the top plate of the lamp. A bottom plate 2 is secured to the plate 1 by spacing bars 3 and 4. A cup shaped member 5 having cylindrical walls is seated against the under side of an insulating plate 6 which separates the memher 5 from the plate 2. The upper and Specification of Letters Patent.

Patented Mar. 6, 1917.

Serial No. 695,831.

lower electrodes are indicated by the numerals T and 3 respectively. The upper electrode 7 is carried by a suitable holder 9, which is in turn secured to a rod 10 guided by a sleeve 11 upstanding from the plate 1. The electromagnet 12, the mounting for which is not shown, is provided with a U-shaped armature 13 which carries a clutch ll, embracing the rod 10. The armature is provided with an upstanding bar 15 to which is secured a cross piece 16. To the ends of this cross piece are pivoted stems 17 secured to the cylinders 18 of two dash pots, the pistons 19 of which are carried by the plate 1. The lower electrode 8 is received within a socket 20 carried by a cross arm 21, the ends of which are guided within slots 22 in tubes 22 secured to the bottom plate 2. One end of the cross arm 21 is secured to a rod 23 which passes longitudinally through one of the members 22 and through the chamber formed by the two parts 2 and 5. To the upper end of the rod 23 is attached a chain or other flexible connection 24. which passes over a pulley 25. The other end of the chain 21 is connected to a counterweight 26. This counterweight comprises a casing 27 closed by a plate 28 (Fig. 4) and a member 29 projects laterally from the casing. The ends of the casing are provided with openings 30 in which are received lugs 31 projecting inwardly from the plate, thus partially filling the openings 30 and leaving smaller open ings 32 through which the spacing bar 3 is adapted to pass. The outer end of the member 29 is formed into a ring and is provided with an opening 33 in which is received the enlarged lower end 34 of the rod 10. The extreme outer end of the member 29 is formed into a finger 35 which is received in a slot 4* in the spacing rod l.

The counterweight 26 and the parts connected thereto are so proportioned with reference to the weight of the lower electrode as to move the latter upwardly when the counterweight is free to move. The counterweight is normally restrained, however, by a clutch 36 which is an arm, one end of which passes through 'a slot 37 in the side of the casing 27, while its opposite end embraces the rod 3. An upwardly extending stem 38 is secured to the clutch 36 by a pin 39. The upper reduced portion of stem 38 passes along and engages one by 'a'. spring l located between the clutch Hill and. the bottom of the casing 27, the upper end or slot 37 serving as a pivot to the clutch, end when the arm i2 is free to move in the opening 43 the spring lifts the clutch and the connected parts into the position shown in Fig. 1, the reduced upper end of stem 38 gently bearing against one edge of the tilting block 40, in which position the clutch 36 engages and binds the rod 3 and prevents descent of the counterweight 26 and the raising oi the lower electrode.

The electrical connections for the lump are indicated in ihig. 1, and as the magnet is simply included in series with the are in a. manner well understood in the art, it is believed that no detailed description of the circuits is necessary.

' The operation of my lump lows W hen the lamp is without current the electrodes are in contact, the ports of the counterweight are in the positions shown in Fig. 2, and the clutch i l rests upon the sleeve 11. Now when current is turned on, the magnet 12, which is in series with the arc, is energized thereby attracting its urnsuis as folture 13 and lifting the clutch it free :trom

the sleeve 11, at the some time gripping the carbon carrying rod it) end lifting the upper electrode 7 from the lower electrode to establish the arc. At the some time, the plate l t on the upper end of the member 3t is lifted tree from the tripping urrn 42, is shown in Fig. l, and the clutch 36 urged by spring 45 binds the counterweight to rod 3, while the upper electrode is free to move. The magnet then regulates the are by the movement of the upper electrode only in response to variations of current in the zero,

till

in or well known nienner. its the electrodes are consumed, the arc tends to lengthen arid the upper electrode 7 end the connected ports descend'until plate d4: engages the tripping errn d2. W hen this telres piece, the block 40 is til ed uboutth e pivot ti, thereby forcing the upper end of the stern inwardly towurd the rod 34 end lowering the inner end of the clutch 86. The clutch is thereby mode to release its hold upon the spacing rod 3 end the'couoterweight 26 is permitted to descend and to move upwardly the lower electrode 8, the upper electrode being free to descend correspondingly, thereby maintaining the are at substantially the some point. As soon its the lower electrode is moved upwnrdly smell amount and the upper-electrode melres its corresponding downward movement, the current in the are and therefore in the operating magnet is increased, when the upper electrode will be again lifted and the plate e l is removed from the tripping stem 42, the magnet thus regulating the movement of the up er electrode, that is to say the length of t e ere, in the same manner as before. lit will be understood that when the upper electrode is consumed to such an extent as to cause the clutch it to come into engagement with the sleeve 11, the clutch will be tripped in the usual manner, thus ment or": s single electrode, and means tor l feeding together both electrodes.

2. in on. are lemp,,e pair of vertically ulined electrodes, means -for moving the upper electrode away from the lower and independently of the lower to establish the arc end for freely reguluting the some, and means responsive to u predetermined move-v ment of theupper electrode toward the lower tor ceusing both electrodes to approach each other.

3. in an arc lamp, 2i peir of vertically ulined electrodes, means for moving the upper electrode owuy from the lower and independently of the lower to establish the ore end for treel lre ulctin the some it norrnully restrained counterweight for cousing the electrodesto inove together in step, and means responsive to the. movement of theupper electrode towurd the lower for releasing the counterweight.

i. in on ere lump, e poir oi vertically ulined electrodes, means for moving the upper electrode away from the lower and independently of the lower to establish the are and for freely reguluting the some, means comprising a counterweight for moving both electrodes toward euch other, and s clutch normslly restraining the movement of the counterweight which'is adapted to be released by the movement of the upper electrode toward lower,

5, in on ere lump, n pair of vertically slined electrodes, means for moving the upper electrode uwuy' from the lower end independently of the lower to establish the are and for freely regulating the some, at counterweight for moving both electrodes toword each other, e clutch ussocisted with said counterweight to normelly restruin the some, and c trippin device movable with the upper electrode for tripping said clutch otter the upper electrode has moved towurd the lower it predetermined distunce.

6. "in an arc lump, e pair of verticully slined electrodes, electromagnetic uterine for llt) lifting theupper electrode from the lower to establish the arc and for freely regulating the same, means comprising a counterweight movable along and guided by a pair of parallel rods for intermittently moving the electrodes toward each other, a clutch associated with the counterweight for normally gripping one of the parallel rods, and means responsive to the movement of the upper electrode for intermittently tripping said clutch. I

7. In an arc lamp, a pair of vertically alined electrodes, electromagnetic means for lifting the upper electrode from the lower to establish the arc and for freely regulating the same, means comprising a counterweight movable along and guided by a pair of parallel rods for intermittently moving the two electrodes toward each other, a clutch associated with the counterweight for normally gripping one of the parallel rods, and means responsive to the movement of the upper electrode toward the lower for tripping said clutch.

8. In an arc lamp, a pair of vertically alined electrodes, electromagnetic means for lifting the upper electrode independently of the lower to establish thear and for freely regulating the same, a downwardly movable counterweight, connections between the counterweight and the lower electrode for moving said lower electrode upwardly when the counterweight moves downwardly,

I independentl M means associated with the counterweight for normally restrainlng the same from movement, and means movable in accordance with the movement of the upper electrode for'releasing said restraining means when the upper electrode has moved toward the lower electrode a predetermined distance.-

9. In an arc lamp, a pair of vertically alined electrodes, means for moving the upper electrode away from the lower and of the lower to establish the are and for reely regulating the same, and

means responsive to a predetermined movement of the upper electrode toward the lower for causing both of the electrodes to approach each other.

4 10. In an arc lamp, a pair of cooperating electrodes, means for connecting the electrodes together so that they feed together in step,'means for rendering one of'said electrodes free from said connecting means whereby the same may be moved away from the other electrode to establish the arc and then moved in accordance with the are requirements, and means releasable in response to the movement of said regulating electrode for restraining the movement of the second electrode during the regulating action of the first electrode.

11. In an arc lamp, a pair of axially alined electrodes, means for connecting the electrodes so that they move together in step, said means comprising a lost motion connection with the upper electrode, means for moving said upper electrode away from the second to establish the arc and for subsequently regulating the same, means for restraining the movement of the second electrode during the regulation of the first and JOHN A. MCMANUS, Jr., "FRANK G 

